Question 60Motor Plants - 1st Asst/Chief70% to pass
During maneuvering on a slow speed diesel engine vessel, a low starting air system pressure alarm is activated. Local starting air receivers' pressure gauges indicate proper pressures, and compressors are running and are 'loaded' up. What could cause the alarm?
AI Explanation
The correct answer is D) Faulty system alarm pressure switch and/or a fault in the alarm circuit.
The reasoning is that if the local starting air receiver pressure gauges indicate proper pressure and the compressors are running and loaded, then the issue is likely not with the starting air system itself, but rather with the alarm system that monitors the starting air pressure. A faulty pressure switch or a fault in the alarm circuit could cause the low starting air pressure alarm to activate even when the actual system pressure is within normal operating range. The other options (A, B, and C) would all involve issues with the starting air system components, which can be ruled out in this scenario.
Related Questions
#58 Intercoolers installed on starting air compressors, reduce the possibility of _______________.#59 A pre-arrival test is being performed with the engine on bridge control. The vessel has a slow speed engine with mechanical starting air system (not electronic). After a stop order, the engine fails to restart in the next ahead direction order. What would be your immediate actions to restart the engine, if the order was still ahead? #61 During the starting of a diesel engine, compression gases are prevented from backing into the air starting system, shown in the illustration, by the_______________. Illustration MO-0046 #62 In a medium-speed marine propulsion engine equipped with direct admission air starting valves, the cylinders without air starting valves fire first because the _______________.#63 Which of the following statements is true concerning the air starting valve, labeled "III", as shown in the illustration? Illustration MO-0046